Rajat, get your hands on “Become What You Are” by Alan Watts.

https://goo.gl/Je01zZ

Become What You Are: Alan W. Watts: 9781570629402 — Amazon.com

There’s a short passage in there where he mentions the old meaning for “want” is “lack”. It’s better taken in the over all context of the chapter in question. However I believe that is what your other book refers to.

Get Watts into you, soak it up. His stuff is solid, spot on.